package 接口.圆的比较大小;
/*
定义一个 Circle类声明radius属性，提供getter和setter方法
 */
public class Circle {
    private Double radius;

    public void setRadius(Double radius) {
        this.radius = radius;
    }

    public Double getRadius() {
        return radius;
    }
    public Circle(Double radius){
        this.radius=radius;
    }
    public Circle(){}

}
